ReL wrote on 2025-04-25, 11:19:

feipoa wrote on 2025-04-25, 08:44:

ReL wrote on 2025-04-25, 08:39:

I have around 40 AM5x86 processors, and only 2 of them run stably at 180MHz and 200MHz. So it's likely more about the CPUs themselves than the jumpers. As soon as a processor requires more than 4V just to run at 160MHz, it means further overclocking is neither possible nor stable.

At what voltage are your Am5x86 chips stable at 200 MHz and in which motherboards? Are you using only a heatsink/fan inside a computer case, are did you add some active cooling? What stability testing did you perform at 200 MHz with the CPU inside a computer case? Thanks!

I've managed to push my Am5x86 chip to 200 MHz on several different motherboards using the same CPU. I don’t have a complete list of the boards right now, but I can take some photos and share them when I get the chance. Even the GA-5486AL board can run at 4×50 MHz with some minor modifications.

As for voltage, I'm running it at 4.0V. For cooling, I'm using a Socket 7 heatsink with a fan spinning at around 5000 RPM. Regarding stability testing — I started working on that, but something came up and I had to put the project aside for a while. Still, I'm thinking about revisiting it and continuing where I left off.

I’m quite sure I’m out of luck with my one and only 5x86 P75 when it comes to clocking it at 180Mhz.
I can still try some other settings to get fairly decent performance though.

Would you mind sharing the jumper settings for 50Mhz bus please?

I’d like to try 50x3 and see how that compares to 160.

The issue I have with my setup is that at 160, I need to use the PCI half divider which results in lower graphics performance than on default 133MHz.
If I don’t use the divider, my system won’t POST again.

I also have a Gigabyye GA-486AM/s so I’ll try that board when I have some time as well.

byte_76 wrote on 2025-04-25, 12:19:

I’m quite sure I’m out of luck with my one and only 5x86 P75 when it comes to clocking it at 180Mhz. I can still try some other […]
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ReL wrote on 2025-04-25, 11:19:

feipoa wrote on 2025-04-25, 08:44:

At what voltage are your Am5x86 chips stable at 200 MHz and in which motherboards? Are you using only a heatsink/fan inside a computer case, are did you add some active cooling? What stability testing did you perform at 200 MHz with the CPU inside a computer case? Thanks!

I've managed to push my Am5x86 chip to 200 MHz on several different motherboards using the same CPU. I don’t have a complete list of the boards right now, but I can take some photos and share them when I get the chance. Even the GA-5486AL board can run at 4×50 MHz with some minor modifications.

As for voltage, I'm running it at 4.0V. For cooling, I'm using a Socket 7 heatsink with a fan spinning at around 5000 RPM. Regarding stability testing — I started working on that, but something came up and I had to put the project aside for a while. Still, I'm thinking about revisiting it and continuing where I left off.

I’m quite sure I’m out of luck with my one and only 5x86 P75 when it comes to clocking it at 180Mhz.
I can still try some other settings to get fairly decent performance though.

Would you mind sharing the jumper settings for 50Mhz bus please?

I’d like to try 50x3 and see how that compares to 160.

The issue I have with my setup is that at 160, I need to use the PCI half divider which results in lower graphics performance than on default 133MHz.
If I don’t use the divider, my system won’t POST again.

I also have a Gigabyye GA-486AM/s so I’ll try that board when I have some time as well.

To enable the 50 MHz bus on the board, you need to solder it, since the necessary pins are not pre-soldered to allow jumper configuration

ReL wrote on 2025-04-25, 12:41:

byte_76 wrote on 2025-04-25, 12:19:

I’m quite sure I’m out of luck with my one and only 5x86 P75 when it comes to clocking it at 180Mhz. I can still try some other […]
Show full quote

ReL wrote on 2025-04-25, 11:19:

I've managed to push my Am5x86 chip to 200 MHz on several different motherboards using the same CPU. I don’t have a complete list of the boards right now, but I can take some photos and share them when I get the chance. Even the GA-5486AL board can run at 4×50 MHz with some minor modifications.

As for voltage, I'm running it at 4.0V. For cooling, I'm using a Socket 7 heatsink with a fan spinning at around 5000 RPM. Regarding stability testing — I started working on that, but something came up and I had to put the project aside for a while. Still, I'm thinking about revisiting it and continuing where I left off.

I’m quite sure I’m out of luck with my one and only 5x86 P75 when it comes to clocking it at 180Mhz.
I can still try some other settings to get fairly decent performance though.

Would you mind sharing the jumper settings for 50Mhz bus please?

I’d like to try 50x3 and see how that compares to 160.

The issue I have with my setup is that at 160, I need to use the PCI half divider which results in lower graphics performance than on default 133MHz.
If I don’t use the divider, my system won’t POST again.

I also have a Gigabyye GA-486AM/s so I’ll try that board when I have some time as well.

To enable the 50 MHz bus on the board, you need to solder it, since the necessary pins are not pre-soldered to allow jumper configuration

Okay, I hoped that it was just another combination of JP7 - 9.

In that case Feipoa has shared his notes earlier in the thread which indicate 50Mhz. Thanks again Feipoa.

I find it to be a bit of a challenge to clean the solder out of the holes to be able to mount the header pins but I’ll see if I can give it a try.